| Summary: | In the presented work, the structural, optical and thermal characteristics of GeO2-PbO-SrO-AlF3-MgF2 glasses have been investigated. In this regard, different germanate glasses containing of PbO, SrO, MgF2 and AlF3 were prepared by conventional melt quenching technique between two steel sheets. The produced samples were characterized using X-ray diffraction, differential thermal calorimetry, Fourier transform infrared and UV-Vis spectroscopy. Based on results, the glass-forming ability and thermal stability of GeO2-PbO glasses increase by replacement of PbO with SrO in glass composition. This replacement has negligible effects on optical properties of prepared glasses and the values of Eg°pt and EU of GeO2-PbO-SrO glassy system are in the range of 2.98–3.02 and 0.27–0.28 eV, respectively. In contrast, the optical properties, overall transparency, glass-forming ability and thermal stability of GeO2-PbO-SrO glasses decrease by replacement of PbO with MgF2 and AlF3.
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